Acacia farnesiana is quite unlikely to end up in
Acaciella, although other American species will.

That's good. Mine are beginning to take on the classic Old World Acacia style,
and I wouldn't want to upset them. Thank goodness they don't attract ants. ;-)
Iris,
Central NY, Zone 5a, Sunset Zone 40
"When you come to a fork in the road, take it." Yogi Berra